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Testing of Large-Diameter Pipe Material for Resistance to SOHIC in the New Twist and Bend Test

Stress Oriented Hydrogen Induced Cracking (SOHIC) is recognized as an individual cracking mechanism in NACE MR0175/ISO 15156-2. SOHIC occurrence is rare and the mechanism not fully understood but thought to be restricted to carbon and low-alloy steels with low strength and low hardness. Several SOHIC resistance test methods have been reported but none of the test methods is currently standardized. The newly developed “twist and bend” test is currently under standardization in NACE TG 536.Within this work SOHIC resistance tests using the “twist and bend” test method were performed on SAWL large-diameter pipes of grades X52 and X65. All relevant sampling positions (base material heat-affected zone longitudinal weld) were investigated and the results were compared to standard four-point bend SSC tests without additional twist. A new test geometry using reduced specimen dimensions that allows testing of smaller specimens for weld regions has also been developed.The SOHIC performance is discussed based on grade microstructure and hardness of the investigated pipe materials. The investigated SAWL large-diameter pipes revealed excellent SOHIC resistance.

Product Number: 51319-12972-SG
Author: Thomas Haase
Publication Date: 2019
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